Hand drawn illustration of north polar owl in a circle sitting on a branch & holding letter. Lizardwizard via Shutterstock

Harry Potter sends messages by owl. The characters of ‘Game of Thrones’ employ ravens. Meanwhile, real-life messenger pigeons have carried messages for thousands of years. In this episode of Stuff to Blow Your Mind, Robert and Joe consider just why the homing pigeon is perfect for this job -- and why owls and ravens are not.